View photojournalist Tailyr Irvine’s photo essay Reservation Mathematics: Navigating Love in Native AmericaIndigenous residents in Missoula and on Irvine’s Flathead Indian Reservation in western Montana share their deep personal, social, and political concerns about the blood quantum system, which can impact Native Americans’ most personal decisions—including with whom they have children. Through seven intimate stories, Irvine shows how blood quantum requirements are increasingly putting pressures on Native Americans’ lives.